# CVE-2026-122189: OpenPPL ppl.nn CUDA Optimizer opt_graph.cc InitQuantization out-of-bounds

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

A vulnerability has been found in OpenPPL ppl.nn up to bb84dc9952809b3a5a0036858a3d9f68af1c83d5. The affected element is the function OptGraph::InitQuantization of the file src/ppl/nn/engines/cuda/optimizer/opt_graph.cc of the component CUDA Optimizer. Such manipulation of the argument per_channel/bit_width/tensor_max/tensor_min/scale leads to out-of-bounds read. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. This product does not use versioning. This is why information about affected and unaffected releases are unavailable. The project was informed of the problem early through an issue report but has not responded yet.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- OpenPPL / ppl.nn: bb84dc9952809b3a5a0036858a3d9f68af1c83d5 (affected). Source: CNA: VulDB

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P; source: CNA: VulDB

- CVSS 3.1: 6.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C; source: CNA: VulDB

- CVSS 3.0: 6.3 (medium); CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C; source: CNA: VulDB

- CVSS 2.0: 7.5 (high); AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:C; source: CNA: VulDB

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-125, CWE-119

## Exploit evidence

- exploit: https://github.com/user-attachments/files/33393000/poc.zip (CNA: VulDB)

## References

- https://vuldb.com/vuln/431163 (CNA: VulDB; vdb-entry, technical-description)

- https://vuldb.com/vuln/431163/cti (CNA: VulDB; signature, permissions-required)

- https://vuldb.com/cve/CVE-2026-122189 (CNA: VulDB; third-party-advisory)

- https://vuldb.com/submit/1028313 (CNA: VulDB; third-party-advisory)

- https://github.com/OpenPPL/ppl.nn/issues/975 (CNA: VulDB; issue-tracking)

- https://github.com/user-attachments/files/33393000/poc.zip (CNA: VulDB; exploit)

- https://github.com/OpenPPL/ppl.nn/ (CNA: VulDB; product)

## Provenance

- CNA: VulDB: https://www.cve.org/CVERecord?id=CVE-2026-122189; retrieved 2026-11-05; source updated 2026-11-05

Revision: 5d6e6c5566759c127d72ba74bfa4c9a8d91ca342a6303a716a8d90530b3eb783

Canonical: https://y2.dev/cve/CVE-2026-122189

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